Grokking Design Patterns for Engineers and Managers
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Mediator Pattern

The Mediator Pattern routes communication between objects through one coordinator, so the objects stop knowing each other.

A shipping form has a country dropdown, a shipping-method dropdown, a price label, and a submit button. Changing the country reloads the methods, which changes the price, which may disable submit. Some countries have no methods at all.

If each component talks to the others directly, every component holds references to three others. Four components need six connections, and a fifth makes it ten

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